Motor stator core design with integral cooling duct within teeth

Abstract

A stator core is provided and includes laminations disposed in a laminated arrangement to form a stator core body having an axial length extending in a lamination dimension. The stator core body includes an annular portion extending along the axial length and teeth extending radially from the annular portion and along the axial length. Each tooth has a trapezoidal shape and is formed to define one or more triangular holes running along the axial length.

What is claimed is: 
     
         1 . A stator core, comprising:
 laminations disposed in a laminated arrangement to form a stator core body having an axial length extending in a lamination dimension, the stator core body comprising:
 an annular portion extending along the axial length; and 
 teeth extending radially from the annular portion and along the axial length, 
 each tooth having a trapezoidal shape and being formed to define one or more triangular holes running along the axial length, 
 wherein the one or more triangular holes in each tooth is a single triangular hole having a radial length which is less than half a radial length of the corresponding tooth. 
   
     
     
         2 . The stator core according to  claim 1 , wherein:
 the teeth are all substantially uniform in size and shape, and   the single triangular holes are all substantially uniform in size and shape.   
     
     
         3 . The stator core according to  claim 1 , wherein:
 each tooth has a first wide portion, a first narrow portion and sidewalls extending between the first wide portion and the first narrow portion, and   each of the single triangular holes defined by each tooth has a second wide portion corresponding with the first wide portion and a second narrow portion corresponding with the first narrow portion.   
     
     
         4 . The stator core according to  claim 1 , wherein the single triangular hole extends radially inwardly from the annular portion. 
     
     
         5 . The stator core according to  claim 1 , wherein the teeth extend radially inwardly from the annular portion or radially outwardly from the annular portion. 
     
     
         6 . A motor, comprising:
 laminations disposed in a laminated arrangement to form a stator core body having an axial length extending in a lamination dimension,   the stator core body comprising an annular cylinder portion extending along the axial length and teeth extending radially outwardly from the annular cylinder portion and along the axial length, each tooth having a trapezoidal shape and being formed to define one or more triangular holes running radially outwardly from the annular cylinder portion and along the axial length to a radially outboard end of the corresponding tooth;   windings wound around the teeth; and   a rotor, which is drivable to rotate about the stator core body and about a longitudinal axis thereof by current being applied to the windings.   
     
     
         7 . The motor according to  claim 6 , wherein the laminations comprise iron. 
     
     
         8 . The motor according to  claim 6 , wherein the one or more triangular holes are receptive of a cooling air flow. 
     
     
         9 . The motor according to  claim 6 , wherein:
 the teeth are substantially uniform in size and shape, and   the one or more triangular holes are substantially uniform in size and shape.   
     
     
         10 . The motor according to  claim 6 , wherein:
 multiple windings are arranged along a radial dimension between neighboring teeth and have a substantially uniform width along the radial dimension,   each tooth has a first wide portion, a first narrow portion and sidewalls extending between the first wide portion and the first narrow portion, and   each of the one or more triangular holes defined by each tooth has a second wide portion corresponding with the first wide portion and a second narrow portion corresponding with the first narrow portion.   
     
     
         11 . The motor according to  claim 6 , wherein the one or more triangular holes in each tooth is a pair of triangular holes bisected by a radially oriented member of the stator core body. 
     
     
         12 . The motor according to  claim 6 , wherein the one or more triangular holes in each tooth is a single triangular hole having a radial length which exceeds half a radial length of the corresponding tooth. 
     
     
         13 . The motor according to  claim 6 , wherein the annular portion is an annular ring portion, the teeth extend radially inwardly from an inner diameter of the annular ring portion and the rotor is rotatable within the stator core body. 
     
     
         14 . The motor according to  claim 6 , wherein the annular portion is an annular cylinder portion and the teeth extend radially outwardly from an outer diameter of the annular cylinder portion.